Preheat oven to 400.,,Mix butter, sugar, and eggs. Blend in flour, baking soda, cream of tartar and salt. Shape dough by rounded teaspoonfuls into balls. Mix 4 teaspoons cinnamon and 1/4 cup sugar in a shallow bowl. Coat each dough ball with the cinnamon sugar mixture.,,______,,Bake 8-10 minutes. Remove immediately from baking sheet